The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

The moisture content of a sludge is reduced from 90% to 80% in a sludg

1.	The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
A.	25%
B.	50%
C.	10%
D.	5%.
Answer» C. 10%